Improvement in millstone-dressing machines



2 Sheets-Sheet 1. W. COPLIN.

v MILLSTONE DRESSING MACHINE. 110.180,006. Patented 11115118, 1876.

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MILLSTNE DRESSING MACHINE.

No.180,006. PatentedJuly18,1875` NA PETERS. PHOTO-LITHOGHAPHER. lWASNINIZYON, D C.

(www, 1 MM UNITED STATES.'

WILBUR COPLIN, QF LOCKPOR-I, MICHIGAN.

IMPROVEMENT IN MILLSTONE-DRESSING MACHINES.

Specification forming part of Lettersl Patent No. 180,006, dated July 18,1876; application led l February 15, 1876.

To all 'whom it may concern:

Be it known that 1, WILBUR COPLIN, ot' Lockport, in the county ot' St. Joseph and State of Michigan, have invented new and useful Improvements in Millstone-Dressing Ma chines; and I do hereby declare the following to be a full,clear, and'exact description `thereof, which will enable others skilled in the art to which my invention appertains to make and use the same, reference being had to the accompanying drawings, forming part .of this specication, in which- Figure 1 represents a side elevation ot' a millstonedressing machine embodying my said invention. Fig.2 represents a general plan or top view of the same when secured to the millstone, showing the angles of the furrows and position of the arm carrying the cutter. Fig. 3 represents a vertical transverse section taken on line a' x, drawn across Fig.f1. Fig. 4 represents a general plan or top view of the turn-.table with cover removed7 showing the arrangement of gearing employed in transmitting motion to the wheel operating the cutter. Fig. 5 represents a vertical transverse section taken on the line g/ y, drawn across Fig. 1. Fig. 6 represents a general plan oi' the parts employed in transmitting a recipro- -cal movement to the parts carrying the cutter.

Fig. 7 represents a vertical transverse section ot' the same, taken on the liixe'zz,drawn across Fig. 6. Figs. 8, 9, 10, and 11 are diagrams of the gear-wheels and shipping-lever employed in determining the direction ofthe movement ot' the pars carrying the cutter, and Fig. 12 represents a cross-section ot the arm supporting the cutter, taken on line o c, drawn across Fig. 1.

Like letters of reference indicate like parts.

My invention relates to that class of millstone-dressing machines employed in forming .the t'urrows on the face ot'the stone; and its object is to provide a machine thotwill cut an accurate and true furrow without being wavy or glazed, and lea ving the featheredge sharp and well-defined; also, to provide a means of protecting the working parts from the dust and grit arising .from the cutting away ofthe stone, and to so arrange the operating parts as to be under the complete and instantaneous control of the operator. To that end my invention consists in the several combinations of parts whereby the objects, as aforesaid, are attained, as will be more fully understood from the following description.

In the drawing, A represents the base of the machine, which is made'ot'cast metal, and is provided with radial depending feet a, a a, through which pass the adjusting-screws c, connected at their lower ends to the loose collars d, adapted to rest upon the surface and near the center of the stone. B B are the connecting-rods for seeming' the machines to the stone. O is a turn-table, made of cast metal and journaled to the. base A, and so arranged as to freely revolve. The turn-table is made hollow, forming a chamber, Uf, withiny which the gear-wheels employed in operating the feed and cutter wheel are secured, as will be hereinafter 'referred to, and is provided with a cover, D, adapted to tightly close the chamber, by which means the dust and grit arising from the cutting of the stone are prevented from coming in contact with the gearwheels and their respectivejournals. D' is a set-screw secured within the shellot' the turntable, and adapted to bear against the journal. l

ot' the base, by which means the turn-table is secured iu a lixed position when adjusted t-o thedesired point. E isa horizontal arm, permanently attached to the side ot' the turntable, and arranged to revolve with it. arm is of the proper length to extend outward slightly beyond the periphery ot' the stone, and is constructed in a. manner suitable to cover andJsupport the outer edges ot' the carrier E and rack- E", and thereby protect its oily surfaces -from grit and dust when acting in conjunction with apron T, hereinafter mentioned, and is arranged in such a position relative to the radius ot 4the-stone as to be in a plane parallel with the radial plane ot' the furrows in the face ofthe stone when the turn table is set at the proper point, and is so attached to the turn-tabe as to admit or being adjusted vertically to a plane parallel with the horizontal plane ot` the furrows to be cut, and

firmly held in position relative to the plane of the furrows by the adjusting screws or bolts d a, screwing into or against the surface of the arm, making the same adjustable at one or both ends, and, if desired, the arm may be wholly supported thereby. E' is a sliding rack, connected to and operating carrier E", which is secured to the arm E by the projecting guides or ways e c, and arranged to admit ofa reciprocating longitudinal movement. F is a cross-head attached to carrier E", and arrangedto move with it. This cross-head is so adjusted as to admit of being raised or lowered, as may be required, and moved to the right or left in a plane ata right angleto the plane of the arm, independent of any lateral movement of the carrier. F is a cutterwheel mounted on a horizontal shaft, G, journaled to pendants ff, attached to the crosshead, and so arranged as to move with the cross-head. H is a vertical shaft, extending upward above cover D of the turn-table, and downward into the center ot' base A, as shown in Fig. 3, and arranged to admit of a free and easy rotary movement, and is also so arranged that when the machine is adjusted to the face of the stone its lower end is imlnediatelyabove the spindle employed in revolving the upper stone, and is connected thereto by passing,

into a socket, g, fitted upon the upper end of the spindle, by which means a rotary move` ment is imparted to the shaft by a rotary movement of the spindle.

H' is a beveled gearwheel, mounted on shaft H, and adjusted to engage with a corresponding gear-pinion, {,on shaft J, journaled in boxes secured to the turn-table above arm E. Mounted on shaft J is a driving-wheel, J', for imparting motion to the cutter-wheel. K isa take-up pulley, loosely mounted upon a trunnion-shaft, h, rigidly secured to the rear end of carrier E", as shown in Fig. 1. K' is a tighteningqmlley, loosely mounted on a trunnion-shaft, h', adjustahly secured to a pendant, t', rigidly attached to the rear end of arm E. K" is the driving-drum, permanently mounted on shaft G of the cutter-wheel. L is the driving-belt. for communicating motion to the cutter, which passes over thedrivingwheel J', and is so adjusted that its front or driving part passes back of and partly around pulley K, while its rear or loose part passes back of and partly around pulley K', thence .forward and around the driving-drum K", as shown in Fig. 1. I

By this arrangement ofthe pulleys relative to the arm and carrier ca rrying the cutterwheel, the carrier, and, consequently, the cut-A ter-wheel, can be moved forward or backward in the direction of the length of the furrow without changing the tension of the belt; and ,the cutter-wheel can be adjusted laterally in the cross-head,from the long furrow to the short furrows in the same section, without adjusting the arm, the length ofthe drivingdrum beingsuch as to admit of the lateral adjustment of the cutter-wheel.

M is a vibrating arm, journaled upon a` vertical hub, j, secured to the center of the base A, and through which shaft H loosely passes. This arm rests upon the upper surface of the hase, and is provided at its end opposite to the hub with a vertical trunnion-shaft, m, to

which is journaled a horizontally-vibrating plate, m', carrying intermediate gear-pinions N N', engaging with each other, and adapted to alternately engage with rack E when the plate is adjusted to its `proper position, either forward or backward. Loosely mounted ou trunnion-shaft fm is a gear-wheel, O, adjusted to engage with a corresponding gear pinion, O', permanently attached to the lower surface of the wheel H' on shaft H. F is a gear-pinion permanently attached to the lower surface of wheel O on trunnion-shaft m, and Iadapted to enga-ge with pinion N', by which means a rotary movementis imparted to said pinions N N' by the rotation ot' shaft H, moving the rack forward and backward, as the pinions are alternately engaged therewith.

The arrangement of these gear-wheels and pinions is such as to decrease the velocity of each wheel receding from shaft H, by which means the rack is moved at the requisite speed to allow the cutter-wheel to freely cut its path through the stone as it isrevolvedin contact therewith.

P'is an adjusting-spring attached to the inner surface ot' the .turn-table, andadapted tobear against the edge of arm M at a point near trunnion m, as shown in Fig. 6. R is a shipping-lever fulcrumed to the base ofthe turn-table, and extending outward longitudinally through a mortise formed in the wall of the shell. The inner end of this lever is adapted to alternately bea-r against stop-pins t t', located on thellower surface of the plate adjacent to the l trunnion m of arm M, by which means an outward movement is imparted to the plate by the contact of the lever with pin t as the outer end of the lever is moved from the rack.

The arrangement of said lever and plate relative to the intermediate gear-pinions and spring P' is suchthat when the outer end of' the lever has reached the limit of its movement toward rack E', pinion N' engages with the rack, as shown in Figs. 6 and 8, and is held in contact by the tension of the spring, moving the rack outward; and when the lever is moved from the rack to the position shown in Fig. 9, the plate moved outward at a right angle from the rack, disei'igaging pinion N' therefrom, when the tension of the spring` forces the plate back to the position shown in Fig. 10, Iand, by a further movement of the lever to the position shown in-Fig. 11, the plate is moved to the properposition to cause pinion N to engage with the rack, moving it in the opposite direction. y

i S is the shifting-rod, pivoted at its inner end to the inner end of shipping-lever R, and loosely secured at its outer end bypassing through a mortise in plate r, attached to the end of arm E. Mounted upon said shifting-rod S are adjustable tripblocks s s', arranged to admit of being Iirmly secured at any desired point y thereon.

`Permmiently attached to the end of theY 180,006 I i a cross-head is-a vertical upright, r', adapted to alternately engage thetrip-blocks as the cross-headhas reached the limit of its move-V The cutter-wheel maybe made of any snit able material that will .perform the function of cutting the furrowsin the face of the stone.

The operation of my said millstone-dress-' ing'machine is as follows: The machine being properly adjusted to the face of the stone" by the connecting-rods B B, so as to bring arm E in the same vertical plane with the long furrow to be formed, and allowing shaft H to enter the socket on the spindle, as previously described, the base of the machine is then adjusted, by mea-ns of the screws c, so as to bring the horizontalplanevof the arm parallel with the horizontal plane of the faceI of the stone, andcross-head F adjusted laterally so as to bring the cutter-wheel Il" to the line of the furrow. The rack E being moved inward, so as to bring -th'e cutter-wheel at the inner vend 4of the furrow, the shippinglever It is moved toward the rack, so as to engage pinion N' therewith, and the tripblocks s s' adjusted on the shifting-rod S,'to determine the distance which the cutter is to move in forming the furrow. Motionis then imparted to the .,spimlle, consequently to shatt H, thereby communicating a rotary motion to the cutter, through the medium of gearwheel H', pinion 1, shaft J, wheel J', belt L, and drum Kll of the cutter-shaft, and at the same time imparting a longitudinal -movcment to the rack, through the medium-of gear-pinion O', wheel O, pinions Pand N', moving'the rack outward until the cutterwheel reaches the periphery of lthe stone, when upright T' of thc cross-head is brought in contact with trip-block s of the shifting- -.rod, moving the latter outward, which shifts the shipping-lever, disengaging pinion N' from the rack, and engaging pinion N therewith, as previously described, when the movement ofthe rack is reversed, throughl the medium of pinion N, and the cutter-wheel carried back to theinner end of thefurrow, bringing upright r in contact with the tripblock s', disengaging pinion N from the rack, and again engaging pinion Ntherewith when the rack moves outward, the cross-head being properly depressed by the adjusting'screw n at each reciprocal movement of the rack, so as to bring the periphery of the cutterwheel in contact with the base of theifurrow, and the machine kept in motion until the furrow is complete.

The shipping-leveris then so adjusted by the opera-tion as to disengage both pinions N landN' from the rack, preventing a further reciprocating movement of the same, when set-screw D' isy loosened, and the turn-table moved, so as to bring the arm in a vertical fplane with the vertical plane of the next long furrow to be finished, and the shipping-lever.

so readjusted as to engage one of the pinions,

N or N', with the rack, and again imparting l a reciprocating movement to the rack, as before. The arm is adjusted to the plane of each long furrow in the lface of the stone until all are tiuished.'

The shippingllever is then adjusted to disengage b oth pinions N N from the rack,when the arm is adjusted to a plane-parallel with the middle furrow, byV turning theturnv-table, as previously stated, and the cutter-wheelv advjnsted laterally in the cross-head, to the furrow, by the set-screw n'.

The shipping-lever is then adjusted. so as to engage one ofthe pinions, N or N', with the rack, when a reciprocating movementis imparted thereto, and the machine continued in motionuntil the furrow is completed'.

The parts are then readjusted to the next middle furrow, in the same manner as when' cutting the long furrows, and so on until all the middle furrows are complete.

The cutter-wheel is then moved over in 'th-e cross-head to the first short furrow by the set-screw n', and when the latter furrow is completed the arm isl set over to bring the cutter-wheel to the next short-furrow by adjusting the turn-table as before, and soon, until all of the short furrows are completed.

Having thus described my invention, what I claim as. new, and desire to secure by Letters Patent, is

1. The combination of the gear-wheels I and H with the system of 'feeding-gears N, N', P, 0, and O', carrier E", and double cross head F, whereby a reciprocating movement is imparted to the cutter-wheel simultaneously with a rotary movement ofthe same, substan- -tially as and for the purpose specified.

movement to each by a: rotary movement of the center Vshaft El, as and-for the purpose specified. Y

5. In combination with piuions N N and plate'm, theshippiug-lever It, substantially as and for the purpose specified.

6. In combination with pinions N vN', plate m, and shipping-lever R, the shifting-rod S,

'provided with the stop-blocks s es', adapted to be operatedupou by upright r of the crosshead, substantially as and `for the purpose specified.

7. InA combination with plate on, carrying the pinions N N', the adjusting-spring P', substantially as and for the purpose specified'.`

8. In combination with `arm 'E and carrier E", the cross-head F, carl-ying the cutter F',

`and `arranged to admit of `both-vertical and lateral adjustment of the cutter to the furrow,

substantially as specified.

9. In combination with the turnLtable G, carrying the gear-Wheel, the 'cover D, arranged to tght-lyolose the chamber containing gear, and'provitling atop jonrna'lffor shaft H, substantially as speeitied.

10. The apron T, in combination with arm E, substantially as and for the purpose specied.

1 1. The hollow extensionot'. theturn-table,` incasing its gears and working parts from dust and grit, substantially iu the manner `shown and specified.

1 WILBUR UOPLIN. Witnesses:

N. U. GRIDLEY, N. HSHERBURNE. 

